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Re: [EnergyPlus_Support] Continue: problem with my IDF file


1.     ** Severe  ** Existing Fluid type for node, incorrect for request. 
Node=DUCT HEATER OUTLET NODE-AHU LGA L/F
   **   ~~~   ** Existing Fluid type=Water, Requested Fluid Type=Air

This was caused by the following input:

SINGLE DUCT:CONST VOLUME:REHEAT,
    CAVsystem-zoneLG1,       !- Name of System
    FCU/AHU Sched,           !- System Availability schedule
    Return Air Outlet Node-zoneLG1,  !- Unit Air Outlet Node
    Supply Air Inlet Node-zoneLG1,  !- Unit Air Inlet Node
    autosize,                !- Maximum air flow rate {m3/s}
    Duct Heater Outlet Node-AHU LGA L/F,  !- Control node
    COIL:Electric:Heating,   !- Reheat Component Object
    Duct Heater-AHU LGA L/F; !- Name of Reheat Component

The heating coil leaving air node has been specified as the control node, but 
the VAV box expects a coil water inlet node here.  This error terminated the 
simulation.  If the simulation terminates before all components have set up 
input, then false node connection errors may be listed at the end of the err 
file (which happened here).

2.  As you realized, because this is electric reheat, the control node should 
be left blank, but then the run crashed after these errors:

   ** Warning ** The design coil load is zero for COIL:Water:SimpleCooling 
COOLING COIL-FCUZONELG4
   **   ~~~   ** The autosize value for max water flow rate is zero
   **   ~~~   ** To change this, input a value for UA, change the cooling 
design day, or lower
   **   ~~~   **   the zone cooling design supply air temperature
   ** Warning ** The design air volume flow rate is zero for COIL:Water:Cooling 
COOLING COIL-FCUZONELG4
   **   ~~~   ** The autosize value for max air volume flow rate is zero

The crash occurs because the design coil load is zero.  A change request 
(CR6475) has been posted to prevent the crash.  But the question is why did it 
size to zero?

Because the cooling design day Day Type is SummerDesignDay, and the cooling 
setpoint schedule for SummerDesignDay is ZoneTempSummer7 which is 32C.  The 
heating setpoint schedule for WinterDesignDay also needs to be changed.  These 
can be fixed by changing the setpoint schedule definitions or by changing the 
design days to be a different day type, such as Monday.  Also, check that the 
proper internal load schedules are being used for the selected design day day 
type.  I tried changing both days to "Monday" but now some of the heating coils 
are sizing to zero - check all of the sizing inputs.

Be sure to fix the upside down floors, too.  (** Warning ** Floor Tilt=0.0, 
much less than expected tilt of 180).

Mike


On 7 Oct 2004, at 23:08, wing sun lee wrote:

> 
> Dear Mike,
> 
> After running my IDF file - "~LG test14 single pump 03a", the message
> "EnergyPlus Crashed" was generated.
> 
> 
> Note: In the Object of Single Duct Const Volume Reheat, I was cancelled out the
> field:control node. It is becase there is no need to enter as using electric
> heater. Original IDF file - ""~LG test14 single pump 03a".
> 
> I don't know why this happen. Please help me!!
> 
> Thanks,
> 
> SAMLEE
> 
> 
> ­É¹L¡B¤@©ç¨â´²¡B©_¬¥§õºû´µ¦^«H...
> ¥þ´ä³Ì¤j¤â¾÷¤U¸ü¤¤¤ß
> http://mobile.yahoo.com.hk/
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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